Ethernet Frame
Last updated
Last updated
The minimum size for an Ethernet frame (Header + Payload + Trailer) is 64 bytes.
The minimum sizer for a payload is 46 bytes.
If the payload is less than 46 bytes, padding bytes are added (all zeros).
Length: 7 bytes (56 bits)
Allows devices to synchronize their receiver clocks
Bit pattern: 10101010
Start Frame Delimiter
Length: 1 byte
Markes the end of the preamble and the beginning of the rest of the frame.
Bit pattern: 10101011
The Layer 2 address of the destination device.
MAC address
Media Access Control
6 byte (48 bits)
Length: 2 bytes
A value of 1500 or less in this field indicates the LENGTH of the encapsulated packet (in bytes).
A value of 1536 or greater in this field indicates the TYPE of the encapsulated packet (usually IPv4 or IPv6), and the length is determined via other methods.
IPv4: 0x0800
IPv6: 0x86DD
ARP: 0x0806
Frame Check Sequence.
Length: 4 bytes.
Detects corrupted data by running a 'CRC' algorithm over the received data.
CRC = Cyclic Redundancy Check.
